172k | 190K | 160K | 123K | 145k | 120K | 158k | 169k |
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| Kaffir Lily | Clivia | miniata |
| Kaffir Lime | Citrus | hystrix |
| Kahili | Hedychium | gardnerianum |
| Kai apple | Aberia | caffra |
| Kalamona | Cassia | gaudichaudii |
| Kalamona | Cassia | glauca |
| Kalanchoe | Kalanchoë | |
| Kale | Brassica | oleracea var. sabellica |
| Kamala | Mallotus | philippinensis |
| Kamchatka rhododendron | Rhododendron | camtschaticum |
| Kangaroo Paws | Anigozanthos | |
| Kangaroo Paws | Anigozanthos | manglesii |
| Kangaroo Vine | Cissus | antarctica |
| Kansas Gayfeather | Liatris | pycnostachya |
| Kantikari | Solanum | xanthocarpum |
| Karit | Cucumis | trigonis |
| Kashmir Tree Mallow | Lavatera | cachmeriana |
| Kashmirian Sage | Phlomis | cashmiriana |
| Katsura Tree | Cercidiphyllum | japonicum |
| Kau Apple | Aberia | kaffra |
| Kau-pau | Ligusticum | chinensis |
| Kava Kava | Piper | methysticum |
| Kelp | Alaria | esculenta |
| kelp | Laminaria | angustata |
| kelp | Laminaria | japonica |
| kelp | Laminaria | longicruris |
| kelp | Laminaria | longissima |
| kelp | Laminaria | ochotensis |
| kelp | Macrocystis | pyrifera |
| kelp | Nereocystis | luetkeana |
| kelp | Pleurophycus | gardneri |
| Kentucky Coffee Tree | Gymnocladus | dioica |
| Kentucky Hemp | Urtica | canadensis |
| Kentucky Hemp | Urtica | cannabina |
| Kermes Oak | Quercus | coccifera |
| Khat | Catha | edulis |
| Kidney Bean | Phaseolus | vulgaris |
| Kidneywort | Cotyledon | umbilicus |
| Killarney Strawberry Tree | Arbutus | unedo |
| King orange | Citrus | deliciosa: |
| King orange | Citrus | nobilis |
| Kingfisher Daisy | Felicia | bergeriana |
| Kiwi fruit | Actinidia | chinensis: |
| kiwifruit | Actinidia | deliciosa |
| Knapwort Harshweed | Centaurea | jacea |
| Kneeling Angelica | Angelica | genuflexa |
| Knobbed Wrack | Fucus | nodosus |
| Knotted Figwort | Scrophularia | nodosa |
| Knotted Geranium | Pelargonium | gibbosum |
| Knotweed | Polygonum | aviculare |
| Kohl Rabi | Brassica | oleracea var. gongylodes |
| Kola Nuts | Cola | vera |
| Korarima Cardamoms | Amomum | kararima |
| Korean Angelica | Angelica | gigas |
| Korean Boxwood | Buxus | microphylla |
| Korean Mint | Agastache | rugosa |
| Korean Pine | Picea | koraiensis |
| Korean Pine | Pinus | koraiensis |
| Kousa Dogwood | Cornus | kousa |
| Kousso | Brayera | anthelmintica: |
| Kousso | Hagenia | abyssinica |
| Kudzu vine | Pachyrhizus | thunbergianus: |
| Kudzu Vine | Pueraria | lobata |
| Kudzu vine | Pueraria | thunbergiana |
| Kuwa | Morus | alba var. stylosa |
| Labrador tea | Ledum | |
| Labrador Tea | Ledum | latifolium |
| Laburnum | Cytisus | laburnum |
| Lace Cap Hydrangea | Hydrangea | macrophylla |
| Lace Flower | Didiscus | |
| Lacebark Elm | Ulmus | parvifolia |
| Lacebark Pine | Pinus | bungeana |
| Lachnanthes | Lachnanthes | tinctoria |
| Lady Fern | Athyrium | filix-femina |
| Lady Lavender | Lavandula | angustifolia ‘Lady’ |
| Lady’s Bedstraw | Galium | verum |
| Lady’s Mantle | Alchemilla | mollis |
| Lady’s Mantle | Alchemilla | vulgaris |
| Lady’s Mantle | Alchemilla | xanthochlora |
| Lady’s Slipper Orchid | Cypripedium | calceolus |
| Lady’s Slippers | Cypripedium | |
| Lady’s Smock | Cardamine | pratensis |
| Lady’s Tresses | Spiranthes | autumnalis |
| Lambang | Aleurites | moluccana |
| Lamb’s Tail | Chiastophyllum | oppositifolium |
| Lance-leaved Catnip | Nepeta | lanceolata |
| Lanhoa | Olea | fragrans |
| Larch | Larix | decidua |
| Large Mediterr Spurge | Euphorbia | characias |
| Large Wintergreen | Pyrola | rotundifolia |
| Large-flowered Beardtongu | Penstemon | grandiflorus |
| Large-flowered Evening Pr | Oenothera | erythrosepala |
| Large-flowered Trillium | Trillium | grandiflorum |
| Large-leaved Aster | Aster | macrophyllus |
| Larger Bittercress | Cardamine | amara |
| Larkspur | Consolida | |
| Larkspur | Consolida | ajacis |
| Larkspur | Consolida | orientalis |
| Laurel-leaved Rock Rose | Cistus | laurifolius |
| Lavender | Lavandula | |
| Lavender Cotton | Santolina | chamaecyparissus |
| Lavender of Dauphine | Lavandula | delphinensis: |
| Lavender Thyme | Thymus | thracicus |
| Lavender Thyme | Thymus | thracius |
| Laver Seaweed | Porphyra | umbilicalis |
| Lawson Cypress | Chamaecyparis | lawsoniana |
| Leadplant | Amorpha | canescens |
| Leafy Spurge | Euphorbia | esula |
| Leather Flower | Clematis | viorna |
| Leatherleaf Mahonia | Mahonia | bealei |
| Leatherleaf Viburnum | Viburnum | rhytidophyllum |
| Leatherwood UK | Cyrilla | racemiflora |
| Lechugilla | Agave | lechugilla |
| Leek | Allium | porrum |
| Lemon | Citrus | limon |
| Lemon Basil | Ocimum | americanum |
| Lemon Licorice Mint | Agastache | breviflora |
| Lemon Mabel Geranium | Pelargonium | x asperum |
| Lemon Marigold | Tagetes | tenuifolia |
| Lemon Mint | Mentha | citrata |
| Lemon Savory | Satureja | biflora |
| Lemon Thyme | Thymus | x citriodorus |
| Lemon Verbena | Aloysia | triphylla |
| Lemonade Sumac | Rhus | trilobata |
| Lemonberry | Rhus | integrifolia |
| Lemongrass | Cymbopogon | citratus |
| Lemongrass | Cymbopogon | flexuosus |
| Lemon-scented Catnip | Nepeta | cataria ‘Citriodora’ |
| Lemon-scented Iron Bark | Eucalyptus | staigeriana |
| Lentil | Ervum | lens |
| Leopard Tree | Caesalpinia | ferrea |
| Leopard’s Bane | Doronicum | |
| Leopard’s Bane | Doronicum | caucasicum |
| Leopard’s Bane | Doronicum | plantagineum |
| Lesser Burdock | Arctium | minus |
| Lesser Celandine | Ranunculus | ficaria |
| Lesser Dodder | Cuscuta | epiphytum |
| Lesser Galangal | Alpinia | officinarum |
| Lesser Nettle | Urtica | urens |
| Lesser Periwinkle | Vinca | minor |
| Lesser Quaking Grass | Briza | minima |
| Lesser Scabious | Scabiosa | columbaria |
| Lesser Scullcap | Scutellaria | minor |
| Lesser Sea Lavender | Limonium | gougetianum |
| Lesser Spearwort | Ranunculus | flammula |
| Lettuce Leaf Basil | Ocimum | frutescens |
| Leyland Cypress | X Cupressocyparis | leylandii |
| Lichen | Candelariella | vitellina |
| Life Root | Senecio | aureus |
| Lilac | Syringa | |
| Lilacs | Syringa | vulgaris |
| Lily | Lilium | |
| Lily of The Valley | Convallaria | majalis |
| Lima Bush Beans | Phaseolus | lunatus |
| Lime | Tilia | europaea |
| Lime Fruit | Citrus | aurantiifolia |
| Lime Geranium | Pelargonium | x nervosum |
| Lime Mint | Mentha | x piperita var. citrata |
| Lime Tree | Tilia | |
| Lime Tree | Tilia | platyphyllos |
| Lime Tree | Tilia | x vulgaris |
| lingonberry | Vaccinium | vitis-idaea |
| Lion’s Ear | Leonotis | |
| Lion’s Ear | Leonotis | leonurus |
| Lion’s Ear | Leonotis | nepetaefolia |
| Lippia | Phyla | scaberrina |
| Liquorice | Glycyrrhiza | glabra |
| Liriope | Liriope | muscari |
| Litchi | Dimocarpus | litchi: |
| Litchi | Litchi | chinensis |
| Litchi | Nephelium | litchi: |
| Litchi | Scytalia | chinensis: |
| Litmus | Roccella | tinctoria |
| Little Bluestem | Andropogon | scoparius |
| Little Elephant’s Head | Pedicularis | attollens |
| Littleleaf Linden | Tilia | cordata |
| Live Oak | Quercus | virens |
| Live Oak | Quercus | virginiana |
| liver lily | Iris | setosa |
| Locust | Robinia | |
| Lodgepole pine | Pinus | contorta var. latifolia |
| Logwood | Haematoxylon | campeachianum |
| London Planetree | Platanus | x acerifolia |
| Long pepper | Chavica | roxburghii: |
| Long Pepper | Piper | longum |
| Long Pepper | Piper | officinarum |
| Longan | Dimocarpus | longana: |
| Longan | Euphoria | longana: |
| Longan | Nephelium | longana |
| Long-leaved Bear’s Breech | Acanthus | balcanicus |
| Long-leaved Mullein | Verbascum | longifolium |
| Long-leaved Speedwell | Veronica | longifolia |
| Long-rooted Garlic | Allium | victorialis |
| Loose-headed Chinese Cabb | Brassica | pekinensis var. |
| Loosestrife | Lysimachia | |
| Loquat | Crataegus | bibas: |
| Loquat | Eriobotrya | japonica |
| Loquat | Mespilus | japonica: |
| Loquat | Photinia | japonica: |
| Lotus | Nelumbium | nelumbo |
| Lotus | Nelumbium | nuciferum: |
| Lotus | Nelumbium | speciosum Willd.: |
| Lovage | Levisticum | |
| Lovage | Levisticum | officinale |
| Love Lies Bleeding | Amaranthus | caudatus |
| Loveapple | Solanum | aculeatissimum |
| Love-in-a-mist | Nigella | |
| Low Cluster Danesblood Be | Campanula | glomerata var. acaulis |
| Low Gumweed | Grindelia | nana |
| Lowbush Blueberry | Vaccinium | angustifolium |
| Luffa | Luffa | aegyptiaca |
| Luffa | Luffa | cylindrica: |
| Lungwort | Sticta | pulmonaria |
| Lutz spruce | Picea | x lutzii |
| Lyre-leaved Sage | Salvia | lyrata |
| Ma Huang | Ephedra | sinica |
| Macassar Agar-Agar | Euchema | spinolum |
| Macassar Mace | Myristica | argentea |
| Madagascar Cardamums | Amomum | angustifolium |
| Madagascar Palm | Pachypodium | lamerii |
| Madagascar Periwinkle | Catharanthus | roseus |
| Madder | Rubia | tinctorum |
| Madonna Lily | Lilium | candidum |
| Madrona | Arbutus | menziesii |
| Madrona | Arctostaphylos | tomentosa |
| Magenta Lamb’s Quarters | Chenopodium | giganteum |
| Magnolia | Magnolia | acuminata |
| Mahoe | Hibiscus | tiliaceus |
| Maiden Pink | Dianthus | deltoides |
| Maidenhair (Canadian) | Adiantum | pedatum |
| Maidenhair (Ethiopia) | Adiantum | aethiopicum |
| Maidenhair (Jamaica) | Adiantum | fragile |
| Maidenhair (Jamaica) | Adiantum | radiatum |
| Maidenhair (Mexico) | Adiantum | trapeziforme |
| Maidenhair Tree | Ginkgo | biloba |
| Maiden’s Wattle | Acacia | maidenii |
| Malabar Nut | Adhatoda | vasica |
| Malabathri Leaves | Cinnamomum | nitidum |
| Malambo Bark | Canella | axillaris |
| Malay Apple | Eugenia | malaccensis |
| Malaysian Spiral Ginger | Tapeinochillis | ananassae |
| Male Fern | Dryopteris | filix-mas |
| Male Kola | Garcinia | kola |
| Malee Box | Eucalyptus | bakeri |
| Mallee Pine | Callitris | preissii var. verrucosa |
| Mallow Rose | Hibiscus | moscheutos |
| Mallows | Althaea | |
| Mallows | Malva | |
| Maltese Cross | Lychnis | chalcedonica |
| Mammee Apple | Mammea | americana |
| Manaca | Brunfelsia | hopeana |
| Manaca | Franciscea | uniflora |
| Manchurian Baby’s Breath | Gypsophila | oldhamiana |
| Manchurian Cherry | Prunus | maackii |
| Manchurian maple | Acer | mandshuricum |
| Mandrake | Atropa | mandragora |
| Mango | Mangifera | indica |
| Mangosteen Fruit | Garania | mangostana |
| Manilla Hemp | Musa | textilis |
| Mankuchoo | Arum | indicum |
| Manna Gum | Eucalyptus | viminalis |
| Many-spiked Cord-grass | Spartina | towsendi |
| Manzanillo | Hippomane | mancinella |
| Manzanita | Arctostaphylos | glauca |
| Mao Gwa | Benincasa | hispida var. chie-que |
| Maple currant | Ribes | acerifolium: |
| Maple currant | Ribes | howellii |
| Maples | Acer | |
| March Orchis | Orchis | latifolia |
| Mare’s tail | Hippuris | |
| Mare’s Tail | Hippuris | vulgaris |
| Marguerite | Argyranthemum | frutescens |
| Marigold | Calendula | |
| Marigold | Tagetes | |
| Mariposa Lilies | Calochortus | |
| Mariposa Lily | Calochortus | uniflorus |
| Marsh cranesbill | Geranium | palustre |
| marsh fivefinger | Potentilla | palustris |
| Marsh Gentian | Gentiana | pneumonanthe |
| Marsh Hog’s Fennel | Peucedanum | palustre |
| marsh marigold | Caltha | |
| Marsh Marigold | Caltha | palustris |
| Marsh Plume Thistle | Carduus | palustris |
| Marsh Ragwort | Senecio | aquaticus |
| Marsh Sow-thistle | Sonchus | palustris |
| Marsh Speedwell | Veronica | scutellata |
| Marsh Tea | Rhododendron | tomentosum |
| Marsh Valerian | Valeriana | dioica |
| Marsh Violet | Viola | palustris |
| Marsh Woundwort | Stachys | palustris |
| Marshmallow | Althaea | officinalis |
| Marvel of Peru | Mirabilis | jalapa |
| Maryland Golden Aster | Chrysopsis | mariana |
| Mask Flower | Alonsoa | |
| Mask Flower | Alonsoa | warscewiczii |
| Massoi Bark | Cinnamomum | burmanni |
| Masterwort | Astrantia | major |
| Masterwort | Astrantia | maxima |
| Masterwort | Peucedanum | ostruthium |
| Mastic | Pistacia | lentiscus |
| Mata | Eupatorium | aromaticum |
| Mata | Eupatorium | incarnatum |
| Matilija Poppy | Romneya | coulteri |
| Matrimony Vine | Lycium | |
| Mauritius Sarsaparilla | Smilax | anceps |
| Maximilian Sunflower | Helianthus | maximiliani |
| Maypop | Passiflora | incarnata |
| Mayweed | Matricaria | |
| Meadow Cranesbill | Geranium | pratense |
| Meadow death-camas | Zygadenus | venenosus |
| Meadow Foam | Limnanthes | |
| Meadow Foam | Limnanthes | douglasii |
| Meadow Plume Thistle | Carduus | pratensis |
| Meadow Rue | Thalictrum | |
| Meadow Saffron | Colchicum | autumnale |
| Meadow Sage | Salvia | pratensis |
| Meadowrue | Thalictrum | dasycarpum |
| Meadowsweet | Filipendula | |
| Meadowsweet | Filipendula | ulmaria |
| Mealy-cup Sage | Salvia | farinacea |
| Medicinal rhubarb | Rheum | officinale |
| Mediterannean Brome | Bromus | lanceolatus |
| Medlar | Mespilus | germanica |
| Melancholy Thistle | Carduus | heterophyllus: |
| Melancholy Thistle | Cirsium | helenioides |
| Melic Grass | Melica | |
| Menthol Plant | Coleus | |
| Mescal Bean | Sophora | secundiflora |
| Mescal Buttons | Anhalonium | lewinii |
| Mescal Buttons | Anhalonium | williamsii |
| Mesquite | Prosopis | |
| Mexican Arrowroot | Dion | edule |
| Mexican Aster | Cosmos | |
| Mexican Cypress | Cupressus | lusitanica |
| Mexican Dragon’s Blood | Croton | draco |
| Mexican Lemon Hyssop | Agastache | mexicana |
| Mexican Marigold | Tagetes | minuta |
| Mexican Mint Marigold | Tagetes | lucida |
| Mexican Orange Blossom | Choisya | ternata |
| Mexican Oregano | Lippia | graveolens |
| Mexican Sage | Salvia | leucantha |
| Mexican Sarsaparilla | Smilax | rotundifolia |
| Mexican Sunflower | Tithonia | |
| Mexican Sunflower | Tithonia | rotundifolia |
| Mexican Sunflower | Tithonia | speciosa |
| Mexican Tulip Poppy | Hunnemannia | fumariaefolia |
| Mexican Valerian | Valeriana | mexicana |
| Mezereon | Daphne | mezereum |
| Michaelmas Daisy UK | Aster | novi-belgii |
| Microphylla Oregano | Origanum | microphyllum |
| Midland Hawthorn | Crataegus | oxyacanthoides |
| Midwest Evening Primrose | Oenothera | lamarckiana |
| Mignonette | Reseda | odorata |
| Milk Thistle | Silybum | |
| Milk Thistle | Silybum | marianum |
| Milk-tree | Brosimum | galactodendron |
| Milkweed | Asclepias | |
| Milky Bellflower | Campanula | lactiflora |
| Mimosa | Mimosa | fragifolia |
| Mimosa | Mimosa | linguis |
| Mint | Mentha | |
| Mint (Bombay) | Mentha | incana |
| Mint (Ceylon) | Mentha | arvensis var. javanesa |
| Mint (China) | Mentha | arvensis var. glabrata |
| Mint-balm | Elsholtzia | stauntonii |
| Mistletoe | Viscum | album |
| Mixta Squash | Cucurbita | mixta |
| Mizuna Greens | Brassica | rapa var. nipposinica |
| Mock-orange | Philadelphus | lewisii |
| Moe’s Gold | Helichrysum | argyrophyllum |
| Monarch of the Veldt | Venidium | fastuosum |
| Money Tree | Eucalyptus | pulverulenta |
| Moneywort | Lysimachia | nummularia |
| Monkey Apple | Clusia | flava |
| Monkey Flower | Mimulus | |
| Monk’s Cap Wolfsbane | Aconitum | ardensii |
| Monk’s Rhubarb | Rumex | alpinus |
| Monsonia | Monsonia | ovata |
| Monterey Cypress | Cupressus | macrocarpa |
| Monterey Pine | Pinus | radiata |
| Montpellier maple | Acer | monspessulanum |
| Moonflower | Calonyction | |
| Moonflower | Datura | meteloides |
| Moonflower | Scabiosa | stellata |
| Moonvine | Ipomoea | alba |
| Moonwort | Botrychium | lunaria |
| Moor’s Cottonthistle | Onopordum | nervosum |
| Mootha | Cyperus | hexastachys |
| Mora De Castilla | Rubus | glaucus |
| Moradilla | Conyza | carminifolia |
| Mormon Tea | Ephedra | viridis |
| Morning Glory | Convolvulus | duartinus |
| Morning Glory | Ipomoea | |
| Morning Glory | Ipomoea | tricolor |
| Morning Glory | Ipomoea | tricolor ‘Heavenly Blue’ |
| Morning Star | Carex | grayi |
| Moroccan Toadflax | Linaria | maroccana ‘Fairy Bouquet’ |
| Mosquito plant | Agastache | cana |
| Mosquito Plant | Ocimum | viride |
| Moss Pink | Phlox | subulata |
| Moss Rose | Portulaca | |
| Moss Rose | Portulaca | grandiflora |
| Moth Beans | Vigna | aconitifolia |
| Moth Mullein | Verbascum | blattaria |
| Mother of Cocoa | Gliricidia | sepium |
| Mother of Thyme | Thymus | pulegioides |
| Motherwort | Leonurus | |
| Motherwort | Leonurus | cardiaca |
| Moujean Tea | Nashia | inaguensis |
| Mount Etna Broom | Genista | aethnensis |
| Mountain alder | Alnus | incana ssp. tenuifolia: |
| Mountain alder | Alnus | tenuifolia |
| Mountain Angelica | Angelica | arguta |
| Mountain Ash | Sorbus | aucuparia |
| Mountain Avens | Dryas | octopetala |
| Mountain Dandelion | Agoseris | grandiflora |
| Mountain Flax | Linum | catharticum |
| Mountain Garland | Clarkia | unguiculata |
| Mountain Grape | Mahonia | aquifolium |
| Mountain Groundsel | Senecio | sylvaticus |
| Mountain Hemlock | Tsuga | mertensiana |
| Mountain Knapweed | Centaurea | montana |
| Mountain ladyslipper | Cypripedium | montanum |
| Mountain Laurel | Kalmia | latifolia |
| Mountain Mahogany | Cercocarpus | |
| mountain mare’s tail | Hippuris | montana |
| Mountain Mint | Pycnanthemum | |
| Mountain Mint | Pycnanthemum | pilosum |
| Mountain Monarda | Monardella | odoratissima |
| Mountain Pea | Thermopsis | |
| Mountain Phlox | Linanthus | grandiflorus |
| Mountain Rose | Rosa | woodsii var. ultramontana |
| Mountain Rose Bay | Rhododendron | catawbiense |
| Mountain Snow | Euphorbia | marginata |
| Mountain Sorrel | Oxyria | reniformis |
| Mountain Sow-thistle | Sonchus | alpina |
| Mountain Sumach | Rhus | copallinum |
| Mountain Thermopsis | Thermopsis | montana |
| Mountain Tobacco | Nicotiana | attenuata |
| Mountain Whitethorn | Ceanothus | cordulatus |
| Mountain Windflower of Gr | Anemone | blanda |
| Mountainbells | Stenanthium | occidentale |
| Mouse Ear | Cerastium | |
| Mouse-ear Hawkweed | Hieracium | pilosella |
| Mouse-eared Chickweed | Cerastium | biebersteinii |
| Mugo Pine | Pinus | mugo |
| Mugwort | Artemisia | igniaria: |
| Mugwort | Artemisia | indica: |
| Mugwort | Artemisia | integrifolia: |
| Mugwort | Artemisia | lavandulaefolia: |
| Mugwort | Artemisia | vulgaris |
| Mulga Acacia | Acacia | aneura |
| Multiflora rose | Rosa | linkii: |
| Multiflora rose | Rosa | multiflora |
| Munjerenje | Albizia | adianthifolia |
| Munstead Lavender | Lavandula | angustifolia ‘Munstead’ |
| Musambra Aloe | Aloë | vulgaris |
| musk mallow | Abelmoschus | moschatus |
| Musk Mallow | Malva | moschata |
| Musk Rose | Rosa | muscatta: |
| musk seed | Hibiscus | abelmoschus: |
| Musk Thistle | Carduus | nutans |
| Mustard Spinach | Brassica | rapa |
| Mutton Bird Sedge | Carex | trifida |
| Myrobalan | Phyllantus | emblica |
| Myrrh | Commiphora | myrrha |
| Myrtle | Myrica | cordifolia |
| Myrtle | Myrica | nagi |
| Myrtle | Myrtus | communis |
| Nagar-motha | Cyperus | pertenuis |
| Nandina | Nandina | domestica |
| Naranjilla | Solanum | quitoense |
| Nard | Valeriana | jatamansi |
| Narrow Leaf | Crowea | angustifolia var. dentata |
| Narrowleaf Coneflower | Echinacea | angustifolia |
| Narrow-leaved Mountain Mi | Pycnanthemum | teniufolium |
| Narrow-leaved Toadflax | Linaria | genistifolia ssp.dalmatica |
| Nasturtium | Tropaeolum | |
| Nasturtium | Tropaeolum | majus |
| Natal Plum | Carissa | grandiflora |
| Neapolitan Santolina | Santolina | neapolitana |
| Needlegrass | Stipa | capillata |
| Neem Tree | Azadirachta | indica |
| Nepal Barberry | Berberis | aristata |
| Nepal Lily | Lilium | nepalensis |
| Nepalese Whorlflower | Morina | longifolia |
| Nepitella | Calamintha | nepeta |
| Netted willow | Salix | reticulata |
| Nettle | Urtica | |
| Nettle-leaved Goosefoot | Chenopodium | murale |
| New England Aster | Aster | novae-angliae |
| New Holland Nutmeg | Atherosperma | moschata |
| New Mexico Sage | Salvia | azurea |
| New Zealand Cabbage Tree | Cordyline | australis |
| New Zealand Cedar | Libocedrus | bidwillii |
| New Zealand Flax | Phormium | tenax |
| New Zealand Speedwell | Hebe | speciosa var. variegata |
| New Zealand Spinach | Tetragonia | expansa: |
| New Zealand Spinach | Tetragonia | tetragonioides |
| N’gai Camphor | Blumea | balcamferi |
| Nigella | Nigella | damascena |
| Night Blooming Cereus | Cereus | grandiflorus |
| Night-blooming Jasmine | Cestrum | nocturnum |
| Nikko fir | Abies | homolepis |
| Nikko Maple USA | Acer | nikoënse |
| Nitre-bush | Nitraria | |
| Nitre-bush | Nitraria | schoberi |
| Noble Fir | Abies | procera |
| Nodding anemone | Anemone | cernua |
| Nodding anemone | Anemone | pulsatilla var. chinensis: |
| Nodding Evening Primrose | Oenothera | syrticola |
| Nodding Pink Onion | Allium | cernuum |
| None So Pretty | Silene | armeria |
| Nootka rose | Rosa | nutkana |
| Norfolk Island Hibiscus | Lagunaria | patersonii |
| Nori | Porphyra | |
| Nori | Porphyra | tenera |
| Nori | Porphyra | yezoensis |
| North America Red Bud | Cercis | canadensis |
| North American Corn Mint | Mentha | canadensis |
| Northern Bilberry | Vaccinium | uliginosum |
| Northern Labrador tea | Ledum | decumbens |
| Northern Labrador tea | Ledum | palustre ssp. decumbens |
| Northern rice root | Fritillaria | camschatcensis |
| Northwestern twayblade | Listera | caulina |
| Norway Maple | Acer | platanoides |
| Norway Spruce | Picea | abies |
| Nutmeg | Myristica | fragrans |
| Nutmeg | Myristica | moschata: |
| Nutmeg Geranium | Pelargonium | x fragrans |
| Nuttall | Stylophorum | diphyllum |
| Oak | Quercus | |
| Oak-leaved Goosefoot | Chenopodium | glaucum |
| Oak-leaved Hydrangea | Hydrangea | quercifolia |
| Oakmoss | Evernia | |
| Oakmoss | Evernia | prunastri |
| Oakmoss | Evernia | purpuracea |
| Oatahette Apple | Spondias | dulcis |
| Oats | Avena | sativa |
| Oceanspray | Holodiscus | discolor |
| Ocotillo | Fouquieria | splendens |
| Ocuba Wax | Myristica | sebifera |
| Officinal Spurge | Euphorbia | resinifera |
| Okra | Abelmoschus | esculentus |
| Okra | Hibiscus | esculentus: |
| Old Fashion Rose Geranium | Pelargonium | graveolens |
| Old Man | Atriplex | nummularia |
| Old man’s beard | Usnea | |
| Old Pink Moss Rose | Rosa | centifolia var. muscosa |
| Old Spice Geranium | Pelargonium | x fragrans ‘Logeei’ |
| Old Woman | Artemisia | stellerana |
| Old-fashioned Baby’s Brea | Gypsophila | paniculata |
| Oleander | Nerium | oleander |
| Oliliuqui | Rivea | corymbosa |
| Olive | Olea | |
| Olive | Olea | europaea |
| Olympic onion | Allium | crenulatum |
| Omega Flax | Linum | usitatissimum ‘Omega’ |
| One-flowered Wintergreen | Pyrola | uniflora |
| One-leaved malaxis | Malaxis | monophyllos |
| Onion-leaved Asphodel | Asphodelus | fistulosus |
| Onions | Allium | |
| Opium poppy | Papaver | somniferum |
| Opium Poppy | Papaver | somniferum var. album |
| Opoponax | Opopanax | chironium |
| Orach | Atriplex | hortensis ‘White or Yellow’ |
| Orange | Citrus | sinensis |
| Orange Ball Tree | Buddleja | globosa |
| Orange Jasmine | Murraya | paniculata |
| Orchid Primrose | Primula | viallii |
| Orchids | Orchis | conopea |
| Orchids | Orchis | coriophora |
| Orchids | Orchis | longieruris |
| Orchids | Orchis | militaris |
| Orchids | Orchis | pyramidalis |
| Orchids | Orchis | saccifera |
| Orchids | Orchis | ustulata |
| Oregano | Origanum | |
| Oregon ash | Fraxinus | latifolia |
| Oregon Fleabane | Erigeron | speciosus var. grandiflorus |
| Oregon iris | Iris | tenax |
| Oriental Bittersweet | Celastrus | orbiculatus |
| Oriental Cashew Nut | Semecarpus | anacardium |
| Oriental Cucumber | Cucumis | sativus ‘Burpless Tasty Green’ |
| Oriental Royal Salep | Allium | macleanii |
| Oriental Woodruff | Asperula | orientalis |
| Origanum of Cyprus | Origanum | dubium |
| Orinoco Tobacco | Nicotiana | latissima |
| Ornamental Goldenrod | Solidago | glomerata |
| Ornamental grass | Brachypodium | sylvaticum |
| Ornamental Grass | Sorghum | nigrum |
| Ornamental Mullein | Verbascum | phoenicum |
| Ornamental Quince | Chaenomeles | speciosa |
| Ornamental Quince | Chaenomeles | x superba |
| Orpine Stonecrop | Sedum | telephium |
| Orris | Iris | pallida |
| Osage Orange | Maclura | pomifera |
| Osage Orange | Toxylon | pomiferum |
| Osha | Ligusticum | porteri |
| Osha Colorado Cough-root | Ligusticum | filicinum |
| Osha del Campo | Angelica | pinnata |
| Oswego Tea | Monarda | didyma |
| Oval Buchu | Agathosma | crenulata |
| Oval-leaved blueberry | Vaccinium | ovalifolium |
| Oval-leaved viburnum | Viburnum | ellipticum |
| Ovate-leaved Sea Purslane | Houckenya | peploides |
| Oven’s wattle | Acacia | pravissima |
| Ox Eye | Buphthalmum | |
| Ox-eye | Buphthalmum | salicifolium |
| Oxeye Daisy | Chrysanthemum | leucanthemum |
| Oxeye Daisy | Leucanthemum | vulgare |
| Ox-eye Sunflower | Heliopsis | helianthoides |
| Ox-tongue | Helmintha | echioides |
| Ozark Sundrops | Oenothera | missouriensis |